JP2011139562A - Power supply device and power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve space efficiency, and to suppress the generation of local heat while avoiding a problem at supplying DC power. <P>SOLUTION: This power supply device includes: an AC-DC converter 1 which converts input AC power into the DC power, and output the DC power to a plurality of machine devices 5; a regeneration power consumption device 2 which is arranged at the AC-DC converter 1, and consumes regeneration power regenerated at the AC-DC converter 1 from the machine device 5; a blocking device 3 which is arranged at the AC-DC converter 1, and blocks leak of the DC power output by the AC-DC converter 1; and a protection device 6c which suppresses arc discharge and surge absorption in the supply line of the DC power. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power supply device and a power supply system.

  For example, when repairing the inner circumference welded portion between the nozzle provided on the side of the reactor vessel and the inlet pipe and outlet pipe connected to the nozzle, the opening corresponding to the position of the nozzle It is known that a bottomed cylindrical gantry having a side surface is installed inside a nuclear reactor vessel, and repair work is performed using this gantry (see, for example, Patent Document 1).

  By placing multiple multi-axis robots on the gantry and remotely operating these multi-axis robots from outside the reactor vessel, it is possible to suppress the entry of workers into the reactor vessel exposed to radiation. is there. The DC power supplied to the servo drivers of a plurality of multi-axis robots is obtained by an AC / DC converter that converts AC power, and the AC / DC converter is installed on the gantry. However, the gantry is installed in a narrow space inside the reactor vessel, and an AC / DC converter that supplies DC power to the servo drivers for each axis of a plurality of multi-axis robots is placed here. It is not space efficient. For example, in an AC / DC converter, a large capacity is required for a capacitor or the like that absorbs rectification and waveform disturbance after rectification. Moreover, in the AC / DC converter, heat is generated from the diode during the rectification process, and it is difficult to return the regenerative power from the motor of the mechanical device to the DC power, so that heat is supplied from the equipment that consumes the regenerative power. Therefore, it is necessary to install equipment for cooling this heat.

  Conventionally, for example, a power supply device (servo control device) described in Patent Document 2 is provided at a required portion on the robot side and a control portion on which a power source and a controller (control portion) are mounted for the purpose of improving the heat dissipation effect. A plurality of servo drivers, and a power supply line and a signal line connecting a plurality of servo drivers in series to each of the power supply and the controller by a daisy chain, and direct current power supplied from the power supply to the servo driver is controlled by the control unit. Converting from AC power.

JP 2006-349596 A Japanese Utility Model Publication No. 7-27298

  By the way, high voltage DC power supplied to the servo driver tends to cause arc discharge. Since DC power is always applied with a constant voltage, an arc that has flowed once cannot be cut unless other conditions are changed. For this reason, it is necessary to solve design problems such as the insulation distance of the connector part and dangers such as electric shock. In addition, since a constant voltage is applied in the same way during leakage or electric shock, it is impossible to avoid danger such as electric shock. Furthermore, it is known that surges (load voltage and overcurrent) occur due to lightning, switching of the distribution system, inrush current at power-on, electrostatic discharge, and the like. Therefore, as in the power supply device described in Patent Document 2, in order to flow direct current power through the separated power line, the problems related to arc discharge, electric leakage, electric shock, and surge must be solved.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and avoids problems when supplying DC power, while improving space efficiency and suppressing local heat generation and power The purpose is to provide a supply system.

  In order to achieve the above object, an electric power supply apparatus according to the present invention includes an AC / DC converter that converts input AC power into DC power and outputs the DC power to a plurality of mechanical devices, and the AC / DC converter. A regenerative power consuming device provided to consume regenerative power regenerated from the mechanical device to the AC / DC converter, and a direct current power output from the AC / DC converter provided in the AC / DC converter. And a protection device for suppressing arc discharge and surge absorption in the DC power supply line.

  According to this power supply device, the leakage of the DC power output from the AC / DC converter is interrupted by the interrupting device. Moreover, arc discharge and surge absorption in the DC power supply line are suppressed by the protective device. For this reason, an AC / DC converter can be arrange | positioned in the place separated from the mechanical apparatus. Moreover, even if the AC / DC converter requires a large-capacity capacitor that absorbs the rectification and turbulence of the waveform after rectification, the working space near the mechanical device can be saved. In addition, since the AC / DC converter can be placed at a location away from the mechanical device, even if the AC / DC converter generates heat from the diode during the rectification process, the AC / DC converter is placed in a cooling environment. By doing so, local heat generation in the work space near the mechanical device can be suppressed. Furthermore, since the AC / DC converter can be arranged at a location separated from the mechanical device, the regenerative power of the motor of the mechanical device connected to the bus system can be circulated in the system and consumed by other mechanical devices. In addition, a facility for consuming regenerative power for each mechanical device is not required, so that space saving and heat source reduction can be realized. Furthermore, since the AC / DC converter can be arranged at a location separated from the mechanical device, the power supply line leading to the work space near the mechanical device is connected to the ground with the DC power from four wires including the ground with the AC power. It is possible to reduce the number to three, and it is possible to save space in the working space of the mechanical device related to the laying of the power supply line.

  In order to achieve the above-described object, the power supply system of the present invention includes an AC / DC converter that converts input AC power into DC power and outputs the output, and DC power output from the AC / DC converter. A plurality of mechanical devices that operate according to the above, a regenerative power consuming device that is provided in the AC / DC converter and that consumes regenerative power regenerated from the mechanical device to the AC / DC converter, and the AC / DC converter And a protection device that suppresses arc discharge and surge absorption in the DC power supply line, and a cutoff device that interrupts leakage of DC power output from the AC / DC converter. To do.

  According to this power supply system, the effect of the above-described power supply device can be obtained, and the mechanical device can be efficiently arranged in the work space in accordance with the work.

  ADVANTAGE OF THE INVENTION According to this invention, while avoiding the problem at the time of supplying direct-current power, while improving space efficiency, generation | occurrence | production of a local heat can be suppressed.

FIG. 1 is a schematic diagram of a power supply device and a power supply system according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a ground circuit of the interrupting device. FIG. 3 is a ground circuit configuration diagram further including a leakage detector and a switch of the circuit breaker.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  As shown in FIG. 1, the power supply device of the present embodiment includes an AC / DC converter 1, a regenerative power consumption device 2, and a cutoff device 3.

  The AC / DC converter 1 converts input AC power into DC power. The converted DC power is supplied to a plurality of mechanical devices 5 via the cable 4. That is, the AC / DC converter 1 supplies DC power to a single machine device 5.

  Although not shown in the drawing, the mechanical device 5 is applied to, for example, inspection work or repair work of a welded portion between a nozzle of a nuclear vessel and an inlet pipe and an outlet pipe connected to the nozzle, There is a multi-axis robot (manipulator) that operates by driving a plurality of servo motors. In the present embodiment, the mechanical device 5 is described as a multi-axis robot, but the mechanical device 5 is not limited to a multi-axis robot. Further, the mechanical device 5 is not limited to the application to the inspection or repair work of the reactor vessel, but may be applied to the manufacturing work in a factory or the like.

  The DC power output from the AC / DC converter 1 is voltage-converted by the DC / DC converter 6, the frequency is changed by the servo driver 7, and supplied to the servo motor of the mechanical device 5. Thereby, the mechanical device 5 is operated. The DC / DC converter 6 and the servo driver 7 are connected to the control unit 8, and the voltage and frequency to be converted are controlled by the control unit 8.

  The regenerative power consumption device 2 is provided in the AC / DC converter 1 and consumes regenerative power regenerated from the mechanical device 5 to the AC / DC converter 1. The regenerative power is regenerative energy remaining in the coil of the servo motor when the mechanical device 5 is stopped. This regenerative electric power is circulated in the bus system in the DC / DC converter 6 and consumed in the other mechanical device 5. The regenerative power that is not consumed by the mechanical device 5 flows back through the cable 4 and is supplied to the AC / DC converter 1. The regenerative power consuming device 2 monitors the voltage, and when the voltage exceeds a predetermined threshold, the regenerative power consuming device 2 supplies regenerative power to the resistor by switching with a semiconductor such as an FET (Field Effect Transistor). The regenerative power supplied to the resistor is discharged as heat. In the regenerative power consuming apparatus 2, a device that consumes regenerative power is not limited to a resistor, and any device that consumes power may be used.

  The DC / DC converter 6 is provided with a switch 6a and a diode 6b for causing the AC / DC converter 1 to regenerate regenerative power. The switch 6a is for interrupting the cable 4. The switch 6a is not limited to a mechanical type or a semiconductor type, but can be cut off by a step-down and semiconductor type such as a chopper circuit. When the switch 6 a is closed, the DC power from the AC / DC converter 1 reaches the mechanical device 5. On the other hand, when the switch 6a is opened, the regenerative power is regenerated in the AC / DC converter 1 via the diode 6b. Opening and closing of the switch 6a is controlled by the control unit 8.

  Further, the DC / DC converter 6 is provided with a protection device 6c. The protective device 6c suppresses arc discharge and surge absorption in the DC power supply line. That is, the arc discharge and surge absorption can be suppressed by the protective device 6c. If it is only suppression of arc discharge, measures can be taken by installing a capacitor, but the technique of Japanese Patent Application No. 2009-264012 is used when mechanical contacts are provided or when measures for surge absorption are taken.

  The interruption | blocking apparatus 3 is provided in the AC / DC converter 1, and interrupts | blocks the leakage of the direct-current power which the AC / DC converter 1 outputs. Such a circuit breaker 3 is disclosed in Japanese Patent Application Laid-Open No. 2009-261039. As shown in FIG. 2, the grounding circuit of the circuit breaker 3 includes a terminal T1, a terminal T2, a power supply line Line1, There are a power feeding line Line2, a power feeding terminal to the load, a terminal T3, and a terminal T4.

  A series connection circuit of a high-resistance resistance element R1 and a resistance element R2 is connected between the power supply line Line1 and the power supply line Line2, and a connection point between the resistance element R1 and the resistance element R2 is grounded. A high direct current voltage is applied between the power supply line Line1 and the power supply line Line2, and high power direct current power supply is performed. For this reason, resistance element R1 and resistance element R2 are high resistance values. A DC positive potential is applied to the terminal T1, a DC negative potential is applied to the terminal T2, a positive potential is applied to the power supply line Line1, and a negative potential is applied to the power supply line Line2. Here, the positive and negative electrodes of the DC potential in the power supply line Line1 and the power supply line Line2 are arbitrary and are not related to the following circuit operation.

  The resistance element R1 and the resistance element R2 may have an arbitrary resistance value ratio unless there is a large difference between the resistance values. Further, the resistance values of the resistance element R1 and the resistance element R2 do not have to be the same, but here, for the sake of simplicity, the resistance values are described as the same resistance value.

  The voltage is divided by the resistance element R1 and the resistance element R2 and grounded. For this reason, the potentials of the feed line Line1 and the feed line Line2 with respect to the ground potential are ½ of the voltage Vi of the input voltage DCV.

  Here, from the viewpoint of voltage, even if an electric shock or the like occurs (the human body receives a potential difference between the ground potential and the potential of the power supply line Line1 or the power supply line Line2), the voltage Vi is ½ and the risk is greatly increased. It is reduced.

  From the viewpoint of current, the resistance element R1 exists between the grounding point and the power supply line Line1, and the resistance element R2 exists between the grounding point and the power supply line Line2. However, since the high-resistance resistance element R1 or the resistance element R2 enters the electric shock sensor in series, the current is limited, and the electric current at the time of electric shock is small and safe.

  Further, from the viewpoint of the grounding effect, since the connection point between the resistance element R1 and the resistance element R2 is grounded, charging of the power supply line Line1 and the power supply line Line2 is reliably prevented. Even if the resistance element R1 and the resistance element R2 have high resistance, charging of the power supply line Line1 and the power supply line Line2 can be sufficiently prevented.

  In FIG. 3, in addition to the grounding circuit of the interrupting device 3 shown in FIG. 2, an electric leakage detector Le and a switch SW are further provided. Components having the same configuration as in FIG. 2, a DC positive potential is applied to the terminal T1, a DC negative potential is applied to the terminal T2, a positive potential is applied to the feed line Line1, and a negative potential is applied to the feed line Line2. Yes. Here, the positive and negative electrodes of the DC potential in the power supply line Line1 and the power supply line Line2 are arbitrary and are not related to the following circuit operation.

  The leakage detector Le detects a leakage current between the power supply line Line1, the power supply line Line2, and the ground. That is, since the ground point is electrically connected to the power supply line Line1 and the power supply line Line2 via the high-resistance resistance element R1 and the resistance element R2, respectively, it is conductive between the power supply line Line1, the power supply line Line2 and the ground. When the body is connected, a current path is formed, and a current flows through the conductor, the resistance element R1, and the resistance element R2. When a conductor is connected between the power supply line Line1 and the ground, a current passing through the resistance element R2 flows through the conductor, and when a conductor is connected between the power supply line Line2 and the ground, the resistance element R1. Current flows through the conductor. The switch SW is controlled by the leakage detector to detect the leakage (including electric shock by the human body) by the leakage detector and switches the contact of the switch SW to cut off the ground. Further, when the occurrence of electric leakage is eliminated, the switch SW is made conductive by being controlled by the electric leakage detector.

  The resistance value ratio between the resistance element R1 and the resistance element R2 is usually 1: 1, but is not necessarily 1: 1. In a state where no leakage occurs, voltages divided by the resistance element R1 and the resistance element R2 are as shown in the following formulas (1) and (2). Here, the resistance value of the resistance element R1 is r1, the resistance value of the resistance element R2 is r2, the voltage across the resistance element R1 is Vr1, the voltage across the resistance element R2 is Vr2, and the voltage value of the input voltage DCV is Vi.

Voltage across resistor element R1: Vr1 = Vi · r1 / (r1 + r2) Equation (1)
Voltage across resistor element R2: Vr2 = Vi · r2 / (r1 + r2) Equation (2)

  In a state where no leakage occurs, Ra has a constant value at Vr1 / Vr2 = Ra, which is the ratio of the voltage Vr2 across the resistor element R2 and the voltage Vr1 across the resistor element R1.

  In the above formulas (1) and (2), it is assumed that a leak has occurred between the feed line Line1 and the ground in a state where the leak detector Le detects the Ra value at Vr1 / Vr2 = Ra. Then, the resistance causing the leakage is inserted in parallel to the resistance element R1, the voltage across the resistance element R1 decreases, Vr1 / Vr2 = Ra1, and Ra1 having a value different from Ra is detected as a leakage detector. Le detects. At this time, Ra1 <Ra, and it can be determined that a leakage has occurred. As a result, the leakage detector Le controls the switch SW, switches the contact of the switch SW from A to B, and releases the ground at the connection point between the resistance element R1 and the resistance element R2. However, the contact B is not necessary. In this way, by canceling the grounding, a current path formed by the leakage cause conductor existing between the ground point and the feed line Line1 and the resistance element R2 (that is, the feed path Line1 → leakage cause conductor → resistance element) R2 → the current path of the power feeding line Line2) is cut off, and the leakage current is cut off.

  Next, if a leakage occurs between the feed line Line2 and the ground, a resistor that causes a leakage is inserted in parallel to the resistance element R2, and the voltage applied to the resistance element R2 decreases. Vr1 / Vr2 = Ra2, and the leakage detector Le detects Ra2 having a value different from Ra. At this time, Ra2> Ra, and similarly, it can be determined that a leakage has occurred. As a result, the leakage detector Le controls the switch SW, switches the contact of the switch SW from A to B, and releases the ground at the connection point between the resistance element R1 and the resistance element R2. However, the contact B is not necessary. In this way, by canceling the grounding, a current path formed between the ground leakage cause conductor and the resistance element R1 between the ground point and the power supply line Line2 (that is, the power supply line Line2 → leakage cause conductor → resistance element) The current path of R1 → feeding line Line1 (current direction is reversed) is interrupted, and the leakage current is interrupted.

  In the above description, the leakage is detected as a change in the ratio between Vr2 and Vr1 as Vr1 / Vr2, but the leakage may be detected as a change in the difference between Vr1 and Vr2.

  In this case, the resistance values of the resistance element R1 and the resistance element R2 are the same, and r1 = r2. The difference between the both-end voltages of the resistance element R1 and the resistance element R2 is Vr1-Vr2 = Di. Di has a constant value. In this state, it is assumed that a leakage occurs between the power supply line Line1 and the ground. Then, the voltage between both ends of the resistance element R1 decreases, Vr1−Vr2 = Di1, and the leakage detector Le detects Di1 having a value different from Di. At this time, Di1 <Di, and similarly, it can be determined that a leakage has occurred. As a result, the leakage detector Le controls the switch SW, switches the contact of the switch SW from A to B, and releases the ground at the connection point between the resistance element R1 and the resistance element R2. However, the contact B is not necessary. In this way, by canceling the grounding, a current path formed by the leakage cause conductor existing between the ground point and the feed line Line1 and the resistance element R2 (that is, the feed path Line1 → leakage cause conductor → resistance element) R2 → the current path of the power feeding line Line2) is cut off, and the leakage current is cut off.

  Next, if a leakage occurs between the feed line Line2 and the ground, the voltage across the resistance element R2 decreases, Vr1−Vr2 = Di2, and the leakage detector Le sets a value of Di2 different from Di. To detect. At this time, Di2> Di, and similarly, it can be determined that a leakage has occurred. Thereby, the leakage detector Le controls the switch SW, switches the contact of the switch SW from A to B, and releases the ground at the connection point of the resistance elements R1 and R2. However, the contact B is not necessary. In this way, by canceling the grounding, a current path formed between the ground leakage cause conductor and the resistance element R1 between the ground point and the power supply line Line2 (that is, the power supply line Line2 → leakage cause conductor → resistance element) The current path of R1 → feeding line Line1 (current direction is reversed) is interrupted, and the leakage current is interrupted.

  In any case where the leakage detector Le detects a ratio or difference between the voltage across the resistance element R1 and the voltage across the resistance element R2, and the leakage detector Le controls the switch SW to interrupt the leakage, When the leakage detector Le detects that there is no difference in the ratio or difference, the leakage detector Le controls the switch SW to return the switch SW to the conductive state. That is, the leakage detector Le detects the Ra value and the Di value such that Vr1 / Vr2 = Ra in the ratio and Vr1−Vr2 = Di in the difference.

  When the electric leakage is restored (Vr1 / Vr2 = Ra or Vr1-Vr2 = Di state), the electric leakage detector Le controls the switch SW to switch to the contact A in the switch SW, and the resistance element R1 and the resistance element Connect the connection point with R2.

  As described above, in any earth leakage, the load current is not interrupted only by releasing the ground. That is, it is only necessary to cancel the grounding when a leakage occurs while reliably preventing charging of the power supply line Line1 and the power supply line Line2.

  Here, in any case where the leakage is detected by changing the ratio or difference between the voltage Vr1 across the resistance element R1 and the voltage Vr2 across the resistance element R2, it is determined that the leakage is greater than a predetermined change value, that is, a predetermined deviation width or more. It is desirable to do. That is, if all the leakages are detected with a very small deviation, a malfunction occurs. Therefore, when the leakage detector Le is determined as leakage, it is determined as leakage by detecting a certain (predetermined) deviation width (detection by the leakage detector Le). Also, when it is determined that the leakage has been restored, it is determined that there is no leakage by detecting less than a certain (predetermined) deviation width in the ratio or difference. In this case, since chattering does not occur, it is effective to provide hysteresis in the deviation width.

  As described above, the power supply device according to the present embodiment is provided in the AC / DC converter 1 that converts input AC power into DC power and outputs the DC power to the plurality of mechanical devices 5, and the AC / DC converter 1. The regenerative power consuming device 2 that consumes the regenerative power that is regenerated from the mechanical device 5 to the AC / DC converter 1, and the DC power that is provided in the AC / DC converter 1 and output from the AC / DC converter 1. And an interrupting device 3 for interrupting electric leakage.

  According to this power supply device, leakage of the DC power output from the AC / DC converter 1 is interrupted by the interrupt device 3. Moreover, arc discharge and surge absorption in the DC power supply line are suppressed by the protective device 6c. For this reason, it becomes possible to arrange the AC / DC converter 1 at a location separated from the mechanical device 5.

  Moreover, even if the AC / DC converter 1 requires a large-capacity capacitor that absorbs rectification and turbulence of the waveform after rectification, the working space near the mechanical device 5 can be saved. become.

  In addition, since the AC / DC converter 1 can be arranged at a location separated from the mechanical device 5, even if the AC / DC converter 1 generates heat from a diode or the like during the rectification process, the AC / DC converter 1 can be By arranging in a cooling environment, it is possible to suppress local heat generation in the work space near the mechanical device 5. For example, when the mechanical device 5 is applied to inspection work or repair work in a reactor vessel (which may be other nuclear equipment of the reactor vessel), heat in a narrow work space in the reactor vessel Can be suppressed. Further, for example, when the mechanical device 5 is applied to a manufacturing operation in a factory or the like, it is possible to suppress the generation of heat in the work space in the building where the mechanical device 5 is installed. As a result, since it is not necessary to provide a cooling facility for cooling the heat generated by the AC / DC converter 1 in the work space, it is possible to contribute to space saving of the work space in the vicinity of the mechanical device 5. It is possible to reduce energy consumption according to the above.

  Furthermore, since the AC / DC converter 1 can be arranged at a location separated from the mechanical device 5, the regenerative power of the motor of the mechanical device 5 connected to the bus system can be circulated in the system and consumed by the other mechanical device 5. In addition, it becomes possible to reduce the power consumption, and the facility for consuming the regenerative power for each mechanical device 5 becomes unnecessary, so that it is possible to save space and reduce the heat source. When the AC / DC converter 1 is arranged in the work space near the mechanical device 5, the regenerative power of the mechanical device 5 is consumed by the regenerative power consuming device 2 of the AC / DC converter 1. It is difficult to recirculate and consume it with the mechanical device 5. Further, when the AC / DC converter 1 is arranged in a work space near the mechanical device 5, heat is generated when the regenerative power of the mechanical device 5 is consumed by the regenerative power consuming device 2 of the AC / DC converter 1. Therefore, it is necessary to install equipment for cooling this heat. In this regard, according to the power supply device of the present embodiment, the AC / DC converter 1 can be arranged at a location separated from the mechanical device 5, thereby enabling recirculation of regenerative power. In addition, since the regenerative power can be recirculated, the amount of regenerative power consumed by the regenerative power consuming device 2 of the AC / DC converter 1 can be reduced, so that the volume of the regenerative power consuming device 2 can be reduced. And the amount of heat generated when the regenerative power consuming apparatus 2 consumes the regenerative power can be reduced. Further, since the amount of heat generated by the regenerative power consuming apparatus 2 can be reduced, it is possible to reduce energy consumption related to cooling of this heat.

  Furthermore, since the AC / DC converter 1 can be arranged at a location separated from the mechanical device 5, the power supply lines leading to the work space in the vicinity of the mechanical device 5 are connected with DC power from four wires including ground with AC power. Therefore, it is possible to reduce the space in the work space of the mechanical device 5 related to the laying of the power supply line.

  The power supply system according to the present embodiment includes an AC / DC converter 1 that converts input AC power into DC power and outputs the DC power, and a plurality of machines that operate using the DC power output from the AC / DC converter 1. The device 5, the regenerative power consuming device 2 that is provided in the AC / DC converter 1 and consumes regenerative power that is regenerated from the mechanical device 5 to the AC / DC converter 1, and the AC / DC converter 1. And an interruption device 3 for interrupting leakage of the DC power output from the AC / DC converter 1. According to this power supply system, the effects of the above-described power supply device can be obtained, and the mechanical device 5 can be efficiently arranged in the work space in conformity with the work.

  As described above, the power supply device and the power supply system according to the present invention are suitable for improving the space efficiency and suppressing the generation of local heat while avoiding problems when supplying DC power. ing.

DESCRIPTION OF SYMBOLS 1 AC / DC converter 2 Regenerative electric power consumption apparatus 3 Shut-off apparatus 4 Cable 5 Mechanical apparatus 6 DC / DC converter 6a Switch 6b Diode 6c Protection apparatus 7 Servo driver 8 Control part Le Leakage detector Line1, Line2 Feeding path R1, R2 Resistance element SW Switch T1, T2, T3, T4 terminal

Claims (2)

An AC / DC converter that converts input AC power into DC power and outputs the DC power to a plurality of mechanical devices;
A regenerative power consuming device that is provided in the AC / DC converter and consumes regenerative power regenerated from the mechanical device to the AC / DC converter;
A breaker provided in the AC / DC converter and blocking leakage of direct current power output from the AC / DC converter;
A protective device for suppressing arc discharge and surge absorption in the DC power supply line;
A power supply device comprising: An AC / DC converter that converts input AC power into DC power and outputs the AC power;
A plurality of mechanical devices operated by direct current power output from the AC / DC converter;
A regenerative power consuming device that is provided in the AC / DC converter and consumes regenerative power regenerated from the mechanical device to the AC / DC converter;
A circuit breaker provided in the AC / DC converter and configured to block leakage of direct current power output from the AC / DC converter;
A protective device for suppressing arc discharge and surge absorption in the DC power supply line;
A power supply system comprising:

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